111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTE_HASH_CRC_H_
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#define _RTE_HASH_CRC_H_
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/**
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* @file
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*
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* RTE CRC Hash
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <nmmintrin.h>
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/**
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* Use single crc32 instruction to perform a hash on a 4 byte value.
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*
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* @param data
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* Data to perform hash on.
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* @param init_val
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* Value to initialise hash generator.
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* @return
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* 32bit calculated hash value.
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*/
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static inline uint32_t
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rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
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{
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return _mm_crc32_u32(data, init_val);
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}
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/**
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* Use crc32 instruction to perform a hash.
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*
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* @param data
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* Data to perform hash on.
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* @param data_len
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* How many bytes to use to calculate hash value.
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* @param init_val
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* Value to initialise hash generator.
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* @return
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* 32bit calculated hash value.
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*/
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static inline uint32_t
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rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
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{
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unsigned i;
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uint32_t temp = 0;
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const uint32_t *p32 = (const uint32_t *)data;
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for (i = 0; i < data_len / 4; i++) {
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init_val = rte_hash_crc_4byte(*p32++, init_val);
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}
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switch (3 - (data_len & 0x03)) {
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case 0:
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temp |= *((const uint8_t *)p32 + 2) << 16;
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/* Fallthrough */
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case 1:
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temp |= *((const uint8_t *)p32 + 1) << 8;
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/* Fallthrough */
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case 2:
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temp |= *((const uint8_t *)p32);
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init_val = rte_hash_crc_4byte(temp, init_val);
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default:
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break;
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}
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return init_val;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_HASH_CRC_H_ */
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